Furutech's FI-25 series IEC connectors are incredible sounding connectors, and are very easy to work with. They require no soldering, and will accept up to two 12 AWG wires per terminal. The metallic parts are made with OCC, OFC copper or highly conductive phosphor bronze, and include Furutech's special "ground jumper" that connects the screws to the safety ground, thus eliminating magnetic interactions. Their clamping mechanism allows superior clamping pressure on the wires. All versions also undergo Furutech's proprietary demagnetization process and cryogenic treatment.